Fragum unedo is a species of cockle, a marine bivalve mollusc in the family Cardiidae, commonly known as the Pacific strawberry cockle. It is found in tropical seas in the Indo-Pacific region and the empty shells are prized for use in decorative crafts.[2]
Fragum unedo can grow to 6.5 cm (2.5 in) in length but 4 cm (1.5 in) is a more usual size. The two domed valves are equal in size and asymmetric, with the beaks in front of the mid line. The outline is sub-quadrate with steeply sloping dorsal margins. The posterior margin is long and almost straight while the anterior margin is evenly rounded. They meet at a distinct, nearly square angle. The strong radial ribs often have small red, thorn-like sculpturing. The margin is deeply crenulated. The texture of the shell is robust, the colour being mainly white but sometimes mottled with reddish mosaic patches.[2][3][4]
Right and left valve of the same specimen:
Right valve
Left valve
Fragum unedo is found in the Indo-Pacific region. The range extends from Mauritius and Sri Lanka to southern Japan, Melanesia and northern Australia. It is a benthic species, living buried in sand or mud between low tide mark and a depth of 60 m (200 ft).[2]
Fragum unedo has a symbiotic relationship with certain micro-algae, zooxanthellae, which live in the mantle and other soft tissues. It is heliophilous, meaning that it needs to expose its mantle above the substrate in order to maximise the amount of sunlight available for photosynthesis. The closely related Fragum fragum is sciaphilous, its symbionts having a much lower light requirement for photosynthesis. It has a large posterior gape and can remain more completely buried in the sediment with less likelihood of predation.[5]
Fragum unedo is a species of cockle, a marine bivalve mollusc in the family Cardiidae, commonly known as the Pacific strawberry cockle. It is found in tropical seas in the Indo-Pacific region and the empty shells are prized for use in decorative crafts.
Fragum unedo is een tweekleppigensoort uit de familie van de Cardiidae.[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1758 door Linnaeus.
Bronnen, noten en/of referenties
莓实脊鸟蛤（学名：Fragum unedo），亦作草莓脊鸟蛤，是帘蛤目鸟尾蛤科的一個物種。舊屬心鸟蛤属[2]，今屬脊鸟蛤属[3][4]。主要分布于南中國海[3]周邊的中国大陆與台湾[2]、印度尼西亚[2][4]、泰國及日本[4]，甚至遠至南太平洋的澳大利亞北部及湯加均有發現[4]。常栖息在浅海沙质海底。
